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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93d877dd77a225b9bd2d1086f50c81fed217055f0d4077b6be3ebdc731990953' 
  AND token = 'FvO8OgaDwU4yeWL5kyrkl5TrMZF7RoAfFzh1McB3AHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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