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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3036a7276eb1b1819011af01bf6db3158abad9f0a001bfa3176413f9aebeb8ae' 
  AND token = 'oXEM3AxhdVJs1akqUq66gbNsI60vGtd4WZsI76UtwdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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