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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e90a1d2489310f2fd2076295bc5085727b374c62345d7ebc2dba4a095a23db98' 
  AND token = 'EHrYL+8jvQxfDFO9UFfuwcHFzVjHz0dt4c4p6xvibcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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