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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce9e7ca7466372a47370a142da9db4ede0e5baf70c938d08596e10bb17bceff' 
  AND token = '8NRw9KQmRndz3Pb20wcA/zWnf3hjCbloqqfv/7fxycg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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