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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '046de3aab7db6529dfb8f12470c4589a01a310cc93144684d32c180963990e54' 
  AND token = 'VtdeBY79xR8Eeq9KYAE5vTipdKBBOGa3aXAVtVpbo64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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