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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd50458779b1ba3fd6fd7856a280c70094f126f4474d6b02abfc27ae1986fd4c' 
  AND token = 'qmM8WL3qd2woI8Tsw8pUXDW3fXVqeNEEJRZ4VM80KVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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