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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c74715a1ab56d395fa15f812ef75b06c159fd1c853a0ef44a27e98e68c44521' 
  AND token = 'gnhYFeaSx3CAPckNowHJ3eQ8//a8G2FSbXhXfgT0iBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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