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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'add2f1bb8d80bee03df98156ed1ee535e7cc76459daef9752fac1eb957871e70' 
  AND token = 'u3vapHH4G8kl6+b4GhajspDldfmr4k9zANITFaTuN14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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