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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b041785a0f90139bd96826a377bc80bd26a215a375c4b9a4c355632ca0be45f' 
  AND token = 'UuHRCmIawnaPO35RjWmbXJThlpACzOLCecszcn0CRcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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