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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb9836d1aab87c93d81a979c3b3cf373b8216d6b26d1b53072064e5d4d05cbe8' 
  AND token = 'lN61zJQgcxrV4ia02kstizDGMRtD6COcHIvgGwN2H0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}