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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eacf70cea685e0348ea3fec4ab70cdd46a31525748d908edc8786c5d347cee4d' 
  AND token = 'g+RPsIYfFUjLtRyBPcEhh7v8QQY1L09xNOMLLeTVWFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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