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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ade6aab9c869ff53bd6efdab348638e75c7ef4fdfb37b95ff45f3783bb85ccf' 
  AND token = 'FUjo5PmqySjX9PpoF00TN2w2yJflprpGH4t9z/G4MEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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