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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fde526fc1fcd36ea26fed5411a6ca0f10202fe1baf2df53803feb16f7ac12528' 
  AND token = 'Hetm2kpj0jRze/pPlSe5KxKkARxUkbcrUZDR2alaH7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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