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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55759e6db6e923693cd0a2704dcd4b3c9a0f414b78a6b68e37549ea3b7a2c6fc' 
  AND token = '585LcfujKxE8TcqqfMGbELsdgtxSCHdcYyxpf/kCJ98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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