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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b28a050283c696636f4d2cbd5163a2c3abb0a3a409adfeb599e432430e3b4dd4' 
  AND token = 'Nl43UzshKb1Sc9rAyLEUMiZziMDevF5DC0wzQlCbK7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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