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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef40ac372f7fac44aaecfce5391bef7ea8ffd7c51c9055691022f2d77d70f169' 
  AND token = 'aQVFsQP+/FLMzLl0IAihT2Lrei2JJwvThsk32vwEEJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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