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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b3c5fb75956f3c0d6910cc4bd77f2978460d6ac9d3e9c5450e18462fc7f96a7' 
  AND token = 'suklEKtv7tJsa0KeYzDD8duEDyuRk/U+sqopzxv7qVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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