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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2ab76369e77e1ab2d3bd71cf2358d19ed1b93fc169b2a934e5ddb4d6108fa81' 
  AND token = 'fqwUMeFmZmMIbm3t1N7jmk83arzWd8RXIU8ozxDnzho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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