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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c79e37be96d43cb7444724ea42804da2240dcac39cf5ed591589b41098e50237' 
  AND token = 'PkULwPeDKCO7brL5Ly6MRpSWvB4PcNhX0tz6UfNHGMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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