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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e4aa6ceeec38bdd885e1d8e6dad2957fad4fc5c3af9df2265b7d5bd6a20ca71' 
  AND token = 'o+/fb9JwnOiwu5dWGkecmEoSbknYHGDEAO6PAUNhZ7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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