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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7903aa02c39012e0a5ad364466f24d576759e39bc3a16c2687af80cd410ae642' 
  AND token = 'qdn0dt9rCA0gxpgX7ZcC4zlBmck42W1wTOSPG8yTj+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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