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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9ec2be7b15a1e9a8f860f91f94471b370c99644bf686f34467607192672f90d' 
  AND token = 'Jrk1gV4+2sQIEgelk84LEiEygBwkQBvs89atq+vPGO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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