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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65f82773867f3fa4e77e9a3aeccb199076c18a28814625ccebb6243ec254d218' 
  AND token = 'g3hMjE14d+Vfl27xCNoYNpf6lJbyPPrc8w3dIsKoGYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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