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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88989620e5a0a2a7d32a06573660a8f9b4c9cfa55229fb9d349e2bb4b7e58b1b' 
  AND token = 'l4nQZxLtP8MG376P1UOJOovzUBBC2/Gt3hx24yI58h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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