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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feb45bf1151d4aec0a55e1a24df57f007c87157cd1d9a70db615aae6b33f7265' 
  AND token = 'd2n0V534+lmtYJfCK80yhXlkXtsKfnM8w4TKTvzVIX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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