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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60d80e92f48331b9faf1305caf156ec5069f0c068bc19e5b30e8f499ae2141e4' 
  AND token = 'uoBzB+yqOxLuTISvgJbO7v7IupQ1VzPy4gklMddHIcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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