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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a7fa4317a7e5f5d9bfed504c9089f471cef409ee224277dd94d00180d157671' 
  AND token = 'J8tGC4n5lO3Hssc3S2CxXoFAjIFjOsleA169QHcdJJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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