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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02430846b5d5f0367e74cff897da0707909c766f92359d1856f0430163c4739c' 
  AND token = 'J7KMSf9zr7CGGrR4uYRvjnv4N7nmVT0f3qjuO4hNCGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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