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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb701f0443c2fc2c7dfe1ea5bbf0f4514c67dcecefea8dc75fe80ee105f45856' 
  AND token = 'UzCYuVnc31PqOPNdNTyQXBHPJAjj7bzQVsL45XALqco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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