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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b58a4e67b0df23910cdd4f92861ed61433f92a1a989b266ee375af9bc0f27ddb' 
  AND token = 'rko9ZAQh6ukW0rCFFVFx/wmCmI6/lD6t2qYL3KdT0ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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