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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b8a84a655cfcf1ee9c7b11fe0f954902bb40e550ea6b73e16145a94b400a013' 
  AND token = 'M4vvz/F5NDjfkMu3+kBjC3KdxTlrExanqlFHU5D27KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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