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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '178e8befafa7b5c7ea2e79de3f704f84e847e5b2b8a5d3756a5e0e2de6db8eea' 
  AND token = 'hXgtPdL0sii7Fy9SRR55EEe5GGtZb2Pq1QfzD5wYq3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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