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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe1063b6634dc49f9ad7336778534ac8e9fdc9ac40b94739de75da1683f3e47d' 
  AND token = 'ZJ4HP2sz4qJWfcFDywkSchboV7QBREm0cCtkorbybAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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