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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed701c2830b981a49b869687c6047965e73aacf2d2b11a500c2ab34ad4ec49bf' 
  AND token = 'IaJHFWTYg+UqmNrtqBNuAaDlfWN0LIywNHe/Oj2TaA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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