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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2dc87cca00dd4da051b4381d17e27e67d9df995fc46a9434ecb057c847042e2' 
  AND token = 'Nf+ikOEzMim6PMI3AZD+xHg7ndfhTFgJAWNmE8vo+fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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