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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2078b2aa7c0e40f3ef686eae27120836d115e4233c1396249e29101da9c55f85' 
  AND token = '0qSYcBBNs89jdjeRk1zR82APRmGQhUH4bHvBrk7j1IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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