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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6520b5d1df230641d880832a561b3c7d20a59310a53fd8dee6e86e59cf637314' 
  AND token = 'mOh9bZ1+2Ykdj+ML8LHDP3jmUuSUQUIcuvt/uc1sclU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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