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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02592d4eb213bc2a176a60d8f70e2b788ed39dbbd172cd259fa2ddbfeac64e72' 
  AND token = '9P+okvm6NJlT0nWEn4cGUx5mEX2aLsmNzFTfgohvmGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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