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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f5f6d0033049830e209ebcc9c9229c26e7064a0b7eb2a5c794acd0f50c6cf1b' 
  AND token = 'kKiB4ZDqBH0kbXLCuoNPuRFC8kXPXBYQ1D4z4fkjql8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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