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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05cc40bf52a6a8958ca2b1c3489394168edc43997f46938b3ead8bf61a4d7152' 
  AND token = '9MmTMn2yx45rF67dO4Oa1MG7xxoeXxq5FPImD5NhT60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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