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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '524776ff5689eaba2bbb9026e15ab4f3164409d6294b115eef93560adc84fe59' 
  AND token = 'EFlcbL02mkXzZL5CZ8JCaGzc+rJeICtf1/roZ7hcI7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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