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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2c65604c1d462d3a7ee1cff6f7e93d2a83a1f5c7b09bf71d3bb2f7ce8b1ca55' 
  AND token = 'B4cZNOJcjEtlbA5LWvHVh18lgtJBPtroHIpwcFqr1ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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