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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1422465bbf346b795790edf72c58ca4a1a2b77e57430d3e5c36991104832957' 
  AND token = 's7M5B6yi6HaeuWjNDuoDkG3rH2TO1Dmf+Taxk2D+gIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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