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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '934e4a873eda2c9f0f8126068dd20977cadcecd4327aaca66e25cb45639f54b3' 
  AND token = 'li+37WtThAL1mVJq9AAduSFGMZH9Oo51qG++nlJU084=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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