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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd202b1c82455b58aa94586553bdf54a190fc7c5f76d1bbe5b0ae6111b6c9f8' 
  AND token = 'A0AgeS/r4Dvmg70O573RRdCcHKQEwmdxsFy6YwxVOSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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