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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afdc676b111c22fd54fe8af2ac26f6cabcd8db040cc815ad9c30658d4fbe4af0' 
  AND token = '8USn9lfoVIwm59B97XSlMmRJUH36rikAxSpXyYo0pi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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