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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06767e8be39a069a3d2a95ab62c9bd57bd2c33ad2ac181c5c202b39c4d1c3ca3' 
  AND token = '7qlY8ApjpHZf5rIlRnv5Y3YVD8SdxuIxH3WHrVeNCZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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