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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e24b70cf89e8bf77abeb34b27bbbfccd62d1b472d22bc2356624830882ac5299' 
  AND token = 'CKsh6LdUO5lotvI9lP9YreDH5FnGq638JCs7KiAnbU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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