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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2874e505542d292d1869ebb5eb258f6fe3e2a01579ab7d35be401d9ef5357e1' 
  AND token = 'iWivcBukRCl3bbZs9qOAeTvZ0JLqLP5iV3RivjWjPiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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