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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b0db536e5a99d2954310f289301e1aa6868eb02949c8e6f5c8713d9e248446b' 
  AND token = 'kV7ZNBrTGt+b4oIyHRnTF+I39Jq2bZ0GMa5Qyb/e4kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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