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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '766d9441aa67f6712f43aec6b47d268ed42af0b4aa26a681d627860fe681d80b' 
  AND token = '4krClsGV30dIWUJ2jd1WIXKNkds5+pXbm6WDhwbsIzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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