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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c0165ccaada88b06484a983351c5d83ccf938498a6a5bf9e7528fcc944053d4' 
  AND token = 'CsyGGnpbY2QO5m7/HcGXKQtrli3rSxIw08s/uLEEbTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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