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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14470e7470f0f0d1b0fcfc58e283e34170bbd1db7c9ea5b014bfe58d3ee37524' 
  AND token = 'ooQZx6DPP4t6VRtlDOKPhFJffwQe1+QcGsrK49RISA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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