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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0601618c7cf771d01ef0662467ab1b35253f3e19eba6150ffc515f7a59614ba1' 
  AND token = 'ehF6EeYN/e8DrSylz13GhSWbiH7EmogM9mW2LjxSwfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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