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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec0f0371488af54bb6c88fe0c6f49852de9a57cae8f16ed27b49a0e3632dc119' 
  AND token = 'YH3UW7EIMxeLD0efXYV5Tkli02vGCEOghW78VxeT9Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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