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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88686d6e0d7a883901a09593a1a5c559477ecdb00b56e38445e54505f8f6d8c8' 
  AND token = '3PQE1bAGFE11zTcV5AY9KV6hz6WK46BATQ+1oHigp60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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